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Description
Arduino Pro Micro - 3.3V-8MHzsku: DEV 12587 Here at SparkFun, we refuse to leave 'good enough' alone. That's why we're adding to our line up of Arduino compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on board and do away with bulky external USB interface. This tiny little board does all of the neat o Arduino tricks that you're familiar with: 4
sku: DEV-12587
Here at SparkFun, we refuse to leave 'good enough' alone. That's why we're adding to our line-up of Arduino-compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface.
This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 8MHz and 3.3V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere.
This is the 3.3V version so, as always, keep in mind the limits of system voltage and so forth. The lower system voltage also has its advantages, though, like ease of use with many common 3.3V sensors.
Note: This board uses a modified version of what's known as the "diskloader" bootloader. This bootloader is still in its infancy so expect some glitchiness here and there. Also, because it works over HID you will need to install some drivers so that your computer will recognize it. A "readme" file in the driver pack below explains how to do this. Also, you'll need to unzip the "add-on" files below into a "hardware" directory inside your Arduino sketchbook (more detail in the readme). This will add the "SparkFun Pro Micro 3.3V/8MHz" option to the board selection menu.
Features
- ATMega 32U4 running at 3.3V/8MHz
- On-Board micro-USB connector for programming
- 4 x 10-bit ADC pins
- 12 x Digital I/Os (5 are PWM capable)
- Rx and Tx Hardware Serial Connections
- Our Smallest Arduino-Compatible Board Yet!
Documents
- Schematic
- Eagle Files
- Datasheet (ATMega 32U4)
- Pro Micro 8MHz Drivers
- Pro Micro 3.3V Add-on
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4.7 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
Love love love Robeez. Best soft soled shoes for baby/toddler just learning to walk.
Size: 12-18 Months Toddler, Color: Grey Leather
I can’t even tell you how much I love these shoes for my kids. My oldest son born 2018 had a pair of Robeez, the shark kind, and I’ve passed them down through all my boys until now- now somehow one of them has gone missing, still looking. So we got these for baby and oh my gosh Robeez has upped their game! The soles are still soft enough to be pliable but have some structure to them, they fit softly enough to accommodate round chubby feet but again have some structure, and they look adorable. The quality is really high and that’s so wonderful to see this day and age when so many things are produced cheaply. These are truly lovely. And they’re very handsome. My sweet boy wore them to a birthday party at the park and they were a hit. I love this brand so much, and these shoes are so cute. I wish I were having more kids to buy more cute pairs :)
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Reviewed in the United States on March 26, 2025
★★★★★ 5
The Perfect First Shoe! Worth the Price.
My little one was just starting the stand/learning to walk and we wanted something to protect his feet while we were out of the house. Since babies/toddlers grow out of their shoes so quickly, I tried desperately to find shoes that didn't cost more than $20. However, I tried about 6 different "cheaper" shoes, all different brands, and nothing would stay on my babies feet. I finally broke down and bought these shoes and they are perfect. I ended up wasting more money trying not to spend too much money on shoes that would be too small after a couple months. It would have been cheaper for me to just buy these shoes to start.
Fit wise they are great. Super easy to put on. They stay on! I appreciate the rubber portion on the sole because it gave my little one more traction when he was learning to walk. They are light way and the sole is very flexible which is important for the proper development of their feet. I just wish they made larger sizes because I am going to have to start the hunt all over for the perfect shoe once he grows out of the biggest size that Robeez sells.
Save yourself time and avoid wasting money on shoes that don't stay on. Just buy these shoes!
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Reviewed in the United States on November 28, 2023
★★★★★ 5
Cute and STABLE
Size: 12-18 Months Toddler, Color: Navy Leather
This brand was recommended by a family member as being good for kids who are learning how to walk, and I definitely agree. My son had a different pair of shoes from Carter’s that fit well and looked cute, but the soles were a little too slick for an early walker despite having little rubberized dots on them. I like that these have more realistic soles, with real traction and support, but still allow the kid’s foot to flex. My son is very comfortable in them and was immediately noticeably more stable while standing and practicing walking in them. Bonus- they are super cute and this design is neutral enough to go with plenty of his clothes. My only small complaint is a little thread coming loose on one shoe, but so far it isn’t causing any issues/doesn’t seem to be unraveling anything structural. Highly recommend overall!
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Reviewed in the United States on May 13, 2022
★★★★★ 4
Great shoes!
Size: 18-24 Months Toddler, Color: Grey Leather
Love these shoes, only shoes I put my 15 month old in. However, they do run small. I bought 12-18 month size and my boy out grew them before 12 months old, I had to repurchase 18-24m to fit perfectly.
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Reviewed in the United States on November 8, 2025
★★★★★ 5
The BEST toddler shoe!!
Size: 18-24 Months Toddler, Color: Brooks Grey Leather
These shoes are 100% worth every penny. They are super easy to get on and off due to the fact that the tongue pulls back fully and they are flexible yet sturdy. They are excellent quality and have maintained great condition with my busy toddler at the park. The wide toe box provides great comfort for my little one’s wide feet. Buy the shoes!!!
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Reviewed in the United States on September 4, 2025